Amplituhedra and origami, II: loop level

Abstract

Building on the recently discovered origami-amplituhedron correspondence, we prove that the BCFW (Britto-Cachazo-Feng-Witten) cells triangulate the $m=4$ amplituhedron in full generality at all loop orders, both in momentum and momentum-twistor space. Along the way, we develop two natural "$L$-punctured" extensions of the positive Grassmannian and relate them via T-duality.

105 pages, 22 figures. Second paper in the series, extending the results of arXiv:2410.09574 from tree level to loop level